A portable and compact laser peening (LP) device was developed to apply LP to infrastructure maintenance. LP treatment of metal materials was performed by this device, and residual stress measurements and fatigue tests were conducted. Even at a pulse energy of less than 10 mJ, compressive residual stress was imparted in a near surface layer of high strength steel (HT780) and aluminum alloy (A7075) to a depth of 0.2 mm and 0.5 mm respectively. The fatigue properties of the materials were also improved.
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